Flutter Routing

onGenerateRoute: (RouteSettings routeSettings) {
            return MaterialPageRoute<void>(
              settings: routeSettings,
              builder: (BuildContext context) {
                switch (routeSettings.name) {
                  case SettingsView.routeName:
                    return SettingsView(controller: settingsController);
                  case SampleItemDetailsView.routeName:
                    return const SampleItemDetailsView();
                  case SampleItemListView.routeName:
                  default:
                    return const SampleItemListView();
                }
              },
            );
          },